Yamaha GYT-0SS56-31-12 Athena 290cc Big Bore Kit for Yamaha YZ250F
Big Bore Cylinder Kits include: Brand new nickel carbide plated cylinder with enlarged water passages, precision made piston with rings, pins, clips, gaskets, O-rings and all other parts that needed for a complete installation. Fits '01-'07 YZ250F.